Re: So where's the rest of the 74HC family?
- From: hmurray@xxxxxxxxxxxxxxx (Hal Murray)
- Date: Sat, 25 Mar 2006 14:12:13 -0600
I'll get a 36 MHz and run the output thru a decade counter. Lessee ... vanilla
74 family can't hack it. We'll go with 74HC. (sound of shuffling pages here)
Here 'tis, but only basic functions - OR, AND, etc - and some others ... except
counters. What happened to all the 74HC stuff over the past 10 years or so,
while I wasn't looking?!
They are still available, maybe not as easily as they were a while
ago. Try the HC192 or HC390. Digikey has them.
But I don't think HC will solve your problem. Even the simple
HC74 only goes at 25 MHz at 4.5V over temp. You might squeek
through if you keep the voltage up keep it cool.
Have you considered one of the cut-to-order osc places?
In the old days they would actually make crystals to any
frequency reasonably quickly. Now you can get osc packages
that have a PLL and are programmed to order. The downside
is jitter from the PLL which might matter if you are running
an A/D.
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- So where's the rest of the 74HC family?
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